// SPDX-License-Identifier: GPL-2.0-only

  /*
   * sd_dif.c - SCSI Data Integrity Field
   *
   * Copyright (C) 2007, 2008 Oracle Corporation
   * Written by: Martin K. Petersen <martin.petersen@oracle.com>

   */
  
  #include <linux/blkdev.h>

  #include <linux/t10-pi.h>

  
  #include <scsi/scsi.h>
  #include <scsi/scsi_cmnd.h>
  #include <scsi/scsi_dbg.h>
  #include <scsi/scsi_device.h>
  #include <scsi/scsi_driver.h>
  #include <scsi/scsi_eh.h>
  #include <scsi/scsi_host.h>
  #include <scsi/scsi_ioctl.h>
  #include <scsi/scsicam.h>

  #include "sd.h"

  /*
   * Configure exchange of protection information between OS and HBA.
   */
  void sd_dif_config_host(struct scsi_disk *sdkp)
  {
  	struct scsi_device *sdp = sdkp->device;
  	struct gendisk *disk = sdkp->disk;
  	u8 type = sdkp->protection_type;

  	struct blk_integrity bi;

  	int dif, dix;

  	dif = scsi_host_dif_capable(sdp->host, type);
  	dix = scsi_host_dix_capable(sdp->host, type);

  	if (!dix && scsi_host_dix_capable(sdp->host, 0)) {
  		dif = 0; dix = 1;
  	}

  	if (!dix)

  		return;

  	memset(&bi, 0, sizeof(bi));

  	/* Enable DMA of protection information */

  	if (scsi_host_get_guard(sdkp->device->host) & SHOST_DIX_GUARD_IP) {

  		if (type == T10_PI_TYPE3_PROTECTION)

  			bi.profile = &t10_pi_type3_ip;

  		else

  			bi.profile = &t10_pi_type1_ip;

  		bi.flags |= BLK_INTEGRITY_IP_CHECKSUM;

  	} else

  		if (type == T10_PI_TYPE3_PROTECTION)

  			bi.profile = &t10_pi_type3_crc;

  		else

  			bi.profile = &t10_pi_type1_crc;

  	bi.tuple_size = sizeof(struct t10_pi_tuple);

  	sd_printk(KERN_NOTICE, sdkp,

  		  "Enabling DIX %s protection
  ", bi.profile->name);

  	if (dif && type) {

  		bi.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;

  		if (!sdkp->ATO)

  			goto out;

  		if (type == T10_PI_TYPE3_PROTECTION)

  			bi.tag_size = sizeof(u16) + sizeof(u32);

  		else

  			bi.tag_size = sizeof(u16);

  		sd_printk(KERN_NOTICE, sdkp, "DIF application tag size %u
  ",

  			  bi.tag_size);

  	}

  
  out:
  	blk_integrity_register(disk, &bi);

  }